If you look in the config guide the recommended card is the decklink extreme 3d. This is the flagship card. It's got analogue, sdi & hdmi I/o. Supports 444, 2k & 3d. It's very robust and works really well with resolve.

I'd recommend the extreme 3d..

Soon they will ship the decklink 4k, the advantage of this is that it will support 4k res. but has very limited I/o options.
It will cost 600.

The decklink studio is 300. But only supports 4:2:2 hd and no 3d.

My strong recommendation is to stay within the resolve config guide parameters and use the extreme 3d card. However all of the decklink cards should work.